SHIRAZ, Iran -- Honking horns. Gridlock. Crowded stores. In the United States, camping offers an escape from the sounds and hassles of city life. Here, families from surrounding villages and towns travel into this city of nearly 4 million to pitch tents right in the middle of the urban hustle. It's vacation, Iranian style. Increasingly popular among families seeking a change of scenery, but more and more irritating to city officials who must handle the influx, urban camping has changed the face of Iran's cities during the warmer months of the year. Earlier this month, brightly colored tents dotted the...